Select the alternative that will improve the highlighted part of the sentence. In case there is no improvement required, select “No improvement”.
They will come if you will invite them.

Correct option is A

Explanation:
In conditional sentences (first conditional), the ‘if’ clause uses simple present, and the main clause uses future tense.
Correct structure: If + present simple, will + verb
Incorrect: if you will invite
Correct: if you invite
Example: “If it rains, we will cancel the picnic.”